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♻️ Move pipe read handler into init

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This commit is contained in:
Ben Chatelain 2019-01-08 22:23:38 -07:00
parent 7636343540
commit 8f94972536
1 changed files with 17 additions and 14 deletions
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31
MasKitTests/OutputListener.swift
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@ -6,7 +6,6 @@
// Copyright © 2019 mas-cli. All rights reserved.
//
import XCTest
import Foundation
/// Test helper for monitoring strings written to stdout. Modified from:
@ -21,25 +20,29 @@ class OutputListener {
/// Buffers strings written to stdout
var contents = ""
init() {
// Set up a read handler which fires when data is written to our inputPipe
inputPipe.fileHandleForReading.readabilityHandler = { [weak self] fileHandle in
strongify(self) { context in
let data = fileHandle.availableData
if let string = String(data: data, encoding: String.Encoding.utf8) {
context.contents += string
}
// Write input back to stdout
context.outputPipe.fileHandleForWriting.write(data)
}
}
}
}
extension OutputListener {
/// Sets up the "tee" of piped output, intercepting stdout then passing it through.
///
/// ## [dup2 documentation](https://linux.die.net/man/2/dup2)
/// `int dup2(int oldfd, int newfd);`
/// `dup2()` makes `newfd` be the copy of `oldfd`, closing `newfd` first if necessary.
func openConsolePipe() {
// Set up a read handler which fires when data is written to our inputPipe
inputPipe.fileHandleForReading.readabilityHandler = { [weak self] fileHandle in
guard let strongSelf = self else { return }
let data = fileHandle.availableData
if let string = String(data: data, encoding: String.Encoding.utf8) {
strongSelf.contents += string
}
// Write input back to stdout
strongSelf.outputPipe.fileHandleForWriting.write(data)
}
var dupStatus: Int32
// Copy STDOUT file descriptor to outputPipe for writing strings back to STDOUT